Thiophene diamine derivatives

ABSTRACT

NOVEL THIOPHENE DIAMINE DERIVATIVES OF THE FORMULA:   2-(((Y)M,(Y)N&#39;&#39;-PHENYL)-N(-R&#39;&#39;)-),4-(((Y)M,(Y)N&#39;&#39;-PHENYL)-   N(-R)-)THIOPHENE   WHEREIN R AND R&#39;&#39; ARE INDEPENDENTLY PRIMARY OR SECONDARY ALKYL HAVING NOT MORE THAN 4 CARBON ATOMS, Y AND Y&#39;&#39; ARE INDEPENDENTLY SELECTED FROM THE GROUP CONSISTING OF ALKYL HAVING A MAXIMUM OF FOUR CARBON ATOMS, HALOGEN, AND NITRO, AND M AND N ARE EACH INTEGERS FROM 0 TO 2; AND METHODS FOR MAKING THESE COMPOUNDS. THESE COMPOUNDS HAVE UNTILITY AS HERBICIDES, ANTHELMINTICS, AND AS INTERMEDIATES FOR MAKING INSECTICIDES.

United States Patent 6 3,594,394 THIOPHENE DIAMINE DERIVATIVES John Paul Chupp, Kirkwood, Mo., assiguor to Monsanto Company, St. Louis, M0. N0 Drawing. Filed July 16, 1969, Ser. No. 842,372 Int. Cl. A0111 9/12; (307d 63/12 U.S. Cl. 260-329AM 8 Claims ABSTRACT OF THE DISCLOSURE Novel thiophene diamine derivatives of the formula:

@ m J] m Y.

S -N- 0 Yll wherein R and R are independently primary or secondary alkyl having not more than 4 carbon atoms, Y and Y are independently selected from the group consisting of alkyl having a maximum of four carbon atoms, halogen, and nitro, and m and n are each integers from 0 to 2; and methods for making these compounds. These compounds have utility as herbicides, anthelmintios, and as intermediates for making insecticides.

This invention relates to novel thiophene diamine derivatives and their preparation. These compounds possess herbicidal and anthelmintic properties. In addition, they are valuable intermediates in the preparation of compounds having insecticidal properties.

The novel compounds of this invention are of the following formula:

molecular cyclization reaction of a-chloro-thioacetanilides of the formulas:

YE.1 s R Y...

S E ll 1 II I ClCHzCN 0 and memo-N4 O Yn Yn wherein R, R, Y, Y, m and n are as previously defined. This reaction is illustrated by the following equation:

Yn I

Y basal 3,594,394 Patented July 20, 1971 Instead of using diiferent a-chloro-thioacetanilides, a single a-chloro-thioacetanilide can be used and the reaction involves the intermolecular cyclization of the a-chloro-thioacetanilide with itself to yield the novel compounds of this invention wherein R and R are the same.

Preferably, only one a-chlorothioacetanilide is used in the intermolecular cyclization reaction. When difierent a-chlorothioacetanilides are used, isomers are obtained which require additional steps in isolating the individual isomers. Isolating the desired compound and separation of isomers are by known conventional techniques, such as fractional distillation, fractional crystallization and the like.

If two different types of u-chlorothioacetanilides are used, equal molar proportions should be used. While the use of a solvent is not essential, it is preferred that a solvent be used. Solvents that may be used include the glycols, cellosolves, alcohols, Water and alcohol water mixtures. The preferred solvent is an alcohol, and preferably methanol.

Suitable glycols for the practice of this invention are ethylene glycol, dimethyl glycol, triethylene glycol, tetraethylene glycol, propylene glycol, dipropylene glycol, 1,3- butylene glycol, 1,4-butylene glycol, and the like. Suitable alcohols for the practice of this invention are ethyl alcohol, methanol, propyl alcohol, isopropyl alcohol, N-butyl alcohol isobutyl alcohol, allyl alcohol, benzyl alcohol, cyclohexanol, furfuryl alcohol, sec-butyl alcohol, tert. butyl alcohol, cetyl alcohol, crotyl alcohol and the like. Suitable cellosolve for the practice of this information are methyl cellosolve, ethyl cellosolve, butyl cellosolve, propyl cellosolve, ethylene cellosolve, propylene cellosove and the like.

The temperature at which the reaction takes place is not critical, but affects the rate at which the thiophene diamine is formed. Thus, the reaction is conveniently conducted at a temperature in the range of from about 50 C. to about 150 C., and preferably from 60 to 90 C. Although this reaction can be carried out at superatmospheric pressures or subatmospheric pressures, atmospheric pressure is generally preferred.

Higher temperatures may be utilized, especially in the wherein R, Y, Y, m and n are as previously defined.

Another method is the direct sulfuration of a a-haloacetanilide, using an aryl thionophosphine sulfide, preferably a phenyl thionophosphine sulfide which is represented by the following formula:

wherein R, Y and Y, m and n are as previously defined, and wherein the organic medium is selected from the group consisting of carbon disulfide, acetonitrile, toluene, benzene, chlorobenzene and carbon tetrachloride, the preferred organic meedium being carbon disulfide. In the preferred method of operation, good results are obtained when reacting two moles of the a-chloroacetanilide, to one mole of the phenylthionophosphine sulfide. The reaction is usually conducted at a temperature of from about 20 to about 50 C. In the reaction between the a-chlorothioacetanilide and the phenylthionophosphinesulfide, the materials are mixed and contacted together and the resulting mixture maintained, with agitation, for a period of time such that the a-chlorothioacetanilide is produced in the reaction zone. Good results are obtained when the reactants are mixed and agitated for a time period of about 20 minutes to 10 hours, the periods being dependent upon the nature of the reactants and the temperature employed. Hindered tX-ChlOI'OflCCtfll'lllldCS usually require longer reaction time periods and/or higher temperatures than unhindered a-chloroacetanilides.

The compounds of this invention were made according to the following examples, parts being by weight, unless otherwise noted:

EXAMPLE 1 N,N diisopropyl N,N' diphenyl 2,4 thiophenediamine was prepared in this example.

The a-chloro-N-isopropylthioacetanilide reactant used in this example was prepared in a suitable vessel equipped with a temperature measuring means and an agitating means. Into the vessel was charged, 16.8 parts of a-chloro- N-isopropylacetanilide and 80 parts of carbon disulfide. To this mixture was added 10.8 parts phenylthionophosphine sulfide. The resulting mixture was stirred at room temperature for about 6 hours. The carbon disulfide was removed and the residue dissolved in methylene chloride and the resultant solution eluted through alumina. Removal of solvent yielded a solid which was recrystallized from aqueous methanolM.P. 6768 C. The product was identified by NMR as a-chloro-N-isopropylthioacetanilide.

Into a suitable vessel was charged 13.1 parts of the achloro-N-isopropylthioacetanilide and 81 parts of meth anol. The resulting mixture was heated under reflux for about 12 hours. Thereafter, the mixture was cooled and crystalline sulfur was removed by filtration. The resulting methanol solution was vacuum treated to remove solvent. The residue obtained was mixed with ether and the ether mixture extracted with water. The combined aqueous extracts were then neutralized with sodium bicarbonate and then extracted with ether. The latter combined ether eX- tracts were dried over anhydrous magnesium sulfate, filtered and the ether removed yielding an oil which solidified on standing. The product obtained was recrystallized from cold pentaneM.P. 74 C.

Analysis.Calculated for C N N S: M.W., 350; C, 75.4; H, 7.44; N, 8.00. Found: M.W., 350 (by mass spec.), C, 75.0; H, 7.94; N, 8.01. Spectral results are as follows: UV A max. (ethanol) 254 (e=15,000), 322 (E=15,000); NMR (CCl,, 6 1.20 (d, 12, 1:7 Hz., CH(CH 3.9- 4.5 (2m, 2, i=7 Hz., CH(CH 6.17 (d, 1, J=1 Hz., thiophene3H), 6.28 (d, 1, 1:1 Hz., thiophene-SH), 6.6-7.38 (m, 10, Aromatic H).

EXAMPLE 2 N,N diethyl-N,N'-diphenyl-2,4-thiophenediamine was prepared by the procedure of Example 1 substituting achloro-N-ethylthioacetanilide for oc-ChlOl'O-N-iSOPlOPYlthioacetanilide to give the desired productM.P. 27.5- 29 C.

Analysis.Calcd. for C OH N S: M.W., 322; C, 74.5; H, 6.88; N, 8.69. Found: M.W., 322 (by mass spec.), C, 74.4; H, 6.90; N, 8.58.

Following the procedure of the foregoing examples, and using the appropriate N-disubstituted a-chlorothioacetanilide, the following 2,4-thiophenediamine derivatives were prepared.

Example:

3 N, N-dimethyl-N, N -diphonyl-2,4-thiophenediamine. 4. N N-diisopr0pyl-N, N-diphenyl-2, 4-thiophenediamine.

A good grade of top soil is placed in aluminum pans and compacted to a depth of to A2" from the top of each pan. A predetermined number of seeds of each of several plant species are placed on top of the soil in the pans. The seeds are covered with a layer of prepared soil, and the pan leveled. The seed-containing pans are placed on a wet sand bench and maintained for approximately 14 days under ordinary conditions of sunlight and watering. N,N'-diisopropyl-N,N'-diphenyl-2,4-thiophenediamine is applied after 14 days in spray form to the plant specimens. The herbicidal sprays are acetone-water solutions containing 0.5% by weight of the herbicide. The treated plants are placed in a greenhouse and the effects are observed and recorded approximately 14 days thereafter.

The post-emergent herbicidal activity index used in this example is based on the average percent injury of each plant species, and is defined as follows:

Numerical scale:

0 Herbicidal activity .1 No herbicidal activity.

2 Slight herbicidal activity.

3 Moderate herbicidal activity. 4 Severe herbicidal activity.

Plant is dead.

The observed data is set forth in the following table the group consisting of alkyl having a maximum of 4 wherein the botanical type is identified by an initial in carbon atoms, halogen and nitro; and m and n are each accordance with the following code: integers from to 2.

A Mol.ning glory H crab grass 2. A compound according to claim 1 in which R and BWild oats IPig weed are ldentlcal- C Brome grass Sugar beets 3. A compound according to churn 2 in which R and D-Rye grass K-Wild buckwheat are P PY E -Radish L- Tomato 4. A compound according to claim 3 which is N,N'- F--Sugar beets MS0rghum diisopropyl-N,N'-diphenyl-2,4-thiophenediamine. G-Foxtail TABLE L-POST-EMERGENT HERBICIDAL ACTIVITY Plant species Contact Compound cone. A B O D E F G H I J K L M N,N-diisop1'0pyl-N,N-diphenyl 2,4thi0phenediamine 0. 5% l 0 0 O 2 l 2 1 3 1 1 0 0 The compounds of this invention are also used as 5. Amethod for preparingacompound of the formula: intermediates to make compounds with insecticidal ac- Ym R tivity, as illustrated by the following example, parts being 1 by weight unless otherwise noted: 0 I Ym EXAMPLE 24 1lt s 2,4-bis(N,N diisopropylanilino) 5 thienyl methyl 25 Y.

ketone of the Structure wherein R and R are independently a primary or secondary alkyl having at least one and a maximum of four carbon atoms; Y and Y are independently selected from the group consisting of alkyl having a maximum of four N carbon atoms, halogen, and nitro; and m and n are ino/\ N tegers from 0 to 2; which comprises heating at elevated S temperatures from about 50 C. to the melting point of the ot-chlorothio-acetanilide an et-chlorothioacetanilide CH3 3 selected from the group consisting of was prepared by the following procedure: -Into a suitable vessel, which contained an ether solu- (a) ClCHzC-N- tion of 29 parts of triethylamine and 100 parts of N,N'- diisopropyl N,N diphenyl-2,4-thiophenediamine, was 40 added 24 parts of acetyl chloride with stirring. Upon and standing for four hours, the mixture was filtered to re- (b) a mixture of (a) with a compound of the formula move the triethylamine hydrochloride. The ether Was S Ym removed from the filtrate, and the residue crystallized from aqueous methanol to give a 23% yield of the desired C1 CH2 C N Q product, 2,4 bis(N,N' diisopropylanilino) 5 thienyl Y..'

methyl ketone. At 5 ppm. this compound was found to exhibit 100% control against Southern Corn Root Wormmediate salt formed with a base.

While the illustrative embodiments of the invention A method according to claim 5 wherein Said have been described hereinbefore with particularity, it rothioacetanilide is will be understood that various other modifications will wherein R, R, Y, Y', m, and n are as previously defined, to form an intermediate salt; and neutralizing the interbe apparent to and can readily be made by those skilled fi in the art without departing from the scope and spirit C1OHt N- O :2 of the invention. Accordingly it is not intended that the scope of the claims appended hereto be limited to the examples and description set forth herein but rather the A method accordlng to c1a1m 6 111 Whlch 331d heat claims be construed as encompassing all the features of mg collducted at a temperoature the range of from patentable novelty which reside in the present invention about 50 abouf 150 111 the Presence 3 including all features which would be treated as equivasald base 15 selectfed fromthe group f lents thereof by those skilled in the art to which the 3 of sodlulp b1carb0nate, trlethylamlpe, ammonla, invention pertains drum hydroxide and potassium hydroxide.

Wh i l i d i 8. A method according to claim 7, in which said 1, A compound f the f l solvent is an alcohol and said base is sodium bicarbonate.

Ym R References Cited 0 UNITED STATES PATENTS 3,143,566 8/1964 Surrey 260490 U mzij wherein R and R are independently a primary or sec- U S Cl XR ondary alkyl, having at least one and a maximum of 4 carbon atoms, Y and Y are independently selected from 71-90; 260-33230; 332.5; 5518; 424-202, 275 

